Abstract

Scratching is a DJ (Disk Jockey) technique for producing rhythmic sounds by moving a record back and forth. It requires a high level of manual dexterity and its difficulty has been likened to playing an instrument. Our goals are: first, ease of use, so that novice user scan start scratching immediately; second, to enable users to scratch while walking. We employ millimeter wave radar sensing technology to replace record movements with mid-air gestures that are captured at 1 kHz.We developed our systems in several iterations with professional DJs. The accompanying movie shows that we could achieve our goals.